package com.bei_en.common.util.OSS.demo;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.UUID;
import com.aliyun.oss.ClientException;
import com.aliyun.oss.OSSClient;
import com.aliyun.oss.OSSException;
import com.aliyun.oss.model.Bucket;
import com.aliyun.oss.model.GetObjectRequest;
import com.aliyun.oss.model.ListObjectsRequest;
import com.aliyun.oss.model.OSSObject;
import com.aliyun.oss.model.OSSObjectSummary;
import com.aliyun.oss.model.ObjectListing;
import com.aliyun.oss.model.PutObjectRequest;

/**
 * This sample demonstrates how to get started with basic requests to Aliyun OSS
 * using the OSS SDK for Java.
 */
public class GetStartedSample {

	private static String endpoint = "oss-cn-shenzhen.aliyuncs.com";
	private static String accessKeyId = "uaRj1UVNYFY6rV1V";
	private static String accessKeySecret = "uEAQR3pgn1uZLITNwEGozLHIJAkgbm";

	private static OSSClient client = null;

	public static void main(String[] args) throws IOException {

		/*
		 * Constructs a client instance with your account for accessing OSS
		 */
		client = new OSSClient(endpoint, accessKeyId, accessKeySecret);

		String bucketName = "my-first-oss-bucket" + UUID.randomUUID();
		String key = "MyObjectKey";

		System.out.println("===========================================");
		System.out.println("Getting Started with OSS SDK for Java");
		System.out.println("===========================================\n");

		try {
			/*
			 * Create a new OSS bucket
			 */
			System.out.println("Creating bucket " + bucketName + "\n");
			client.createBucket(bucketName);

			/*
			 * Determine whether the newly bucket exists
			 */
			boolean exists = client.doesBucketExist(bucketName);
			System.out.println("Does bucket " + bucketName + " exist? "
					+ exists + "\n");

			/*
			 * List the buckets in your account
			 */
			System.out.println("Listing buckets");
			for (Bucket bucket : client.listBuckets()) {
				System.out.println(" - " + bucket.getName());
			}
			System.out.println();

			/*
			 * Upload an object to your bucket
			 */
			System.out.println("Uploading a new object to OSS from a file\n");
			client.putObject(new PutObjectRequest(bucketName, key,
					createSampleFile()));

			/*
			 * Determine whether an object residents in your bucket
			 */
			exists = client.doesObjectExist(bucketName, key);
			System.out.println("Does object " + bucketName + " exist? "
					+ exists + "\n");

			/*
			 * Download an object from your bucket
			 */
			System.out.println("Downloading an object");
			OSSObject object = client.getObject(new GetObjectRequest(
					bucketName, key));
			System.out.println("Content-Type: "
					+ object.getObjectMetadata().getContentType());
			displayTextInputStream(object.getObjectContent());

			/*
			 * List objects in your bucket by prefix
			 */
			System.out.println("Listing objects");
			ObjectListing objectListing = client
					.listObjects(new ListObjectsRequest(bucketName)
							.withPrefix("My"));
			for (OSSObjectSummary objectSummary : objectListing
					.getObjectSummaries()) {
				System.out.println(" - " + objectSummary.getKey() + "  "
						+ "(size = " + objectSummary.getSize() + ")");
			}
			System.out.println();

			/*
			 * Delete an object
			 */
			// System.out.println("Deleting an object\n");
			// client.deleteObject(bucketName, key);

			/*
			 * Delete a bucket
			 */
			// System.out.println("Deleting bucket "+bucketName+"\n");
			// client.deleteBucket(bucketName);
		} catch (OSSException oe) {
			System.out
					.println("Caught an OSSException, which means your request made it to OSS, "
							+ "but was rejected with an error response for some reason.");
			System.out.println("Error Message: " + oe.getErrorCode());
			System.out.println("Error Code:       " + oe.getErrorCode());
			System.out.println("Request ID:      " + oe.getRequestId());
			System.out.println("Host ID:           " + oe.getHostId());
		} catch (ClientException ce) {
			System.out
					.println("Caught an ClientException, which means the client encountered "
							+ "a serious internal problem while trying to communicate with OSS, "
							+ "such as not being able to access the network.");
			System.out.println("Error Message: " + ce.getMessage());
		} finally {
			/*
			 * Do not forget to shut down the client finally to release all
			 * allocated resources.
			 */
			client.shutdown();
		}
	}

	private static File createSampleFile() throws IOException {

		File file = File.createTempFile("oss-java-sdk-", ".txt");
		file.deleteOnExit();

		Writer writer = new OutputStreamWriter(new FileOutputStream(file));
		writer.write("abcdefghijklmnopqrstuvwxyz\n");
		writer.write("0123456789011234567890\n");
		writer.close();

		return file;
	}

	private static void displayTextInputStream(InputStream input)
			throws IOException {

		BufferedReader reader = new BufferedReader(new InputStreamReader(input));
		while (true) {
			String line = reader.readLine();
			if (line == null)
				break;

			System.out.println("    " + line);
		}
		System.out.println();

		reader.close();
	}

}
